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Dentin Properties and Structure

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Questions and Answers

What is the primary reason why dentin is more sensitive than enamel?

Dentin has a higher inorganic content.

Dentin contains nerve endings. (correct)

Dentin is continuously formed throughout life.

Dentin is more radiopaque than enamel.

Which statement accurately describes the formation of dentin compared to enamel?

Dentin is continuously formed throughout life, while enamel is only formed during tooth development. (correct)

Dentin is formed only in childhood, while enamel continues to form throughout life.

Both dentin and enamel are formed during tooth development.

Both dentin and enamel stop forming after the tooth is fully developed.

Which of the following best describes the color of dentin?

Dark brown, remaining consistent with age

Yellowish, becoming darker with age (correct)

Translucent or clear

Bright white

What is a characteristic of dentin's permeability?

<p>Dentin's permeability decreases when tubules are blocked.</p> Signup and view all the answers

How does the hardness of dentin compare to enamel and cementum?

<p>Dentin is less hard than enamel but harder than cementum.</p> Signup and view all the answers

Study Notes

Dentin

Dentin is a mineralized tissue forming the bulk and shape of teeth
Dentin is sensitive
Dentin is continuously formed throughout life

Physical Properties of Dentin

Color: Yellowish, darkening with age
Thickness: Varies from 3-10 mm, potentially more
Elasticity: High degree of elasticity; acts as a shock absorber for overlying enamel, explaining "undermined enamel"
Hardness: Less hard than enamel but harder than cementum and bone; wears faster than enamel; harder in the center of the tooth compared to the periphery
Radio Density: More radiolucent than enamel, more radio-opaque than cementum
Permeability: Highly permeable due to dentinal tubules; permeability decreases when tubules are blocked

Chemical Structure of Dentin

Organic: 25-30% (e.g., glycoproteins, lipids, water)
Inorganic: 70-75% (e.g., hydroxyapatite crystals)

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Description

Explore the fascinating properties and chemical structure of dentin, the mineralized tissue that forms the bulk of teeth. Learn about its physical characteristics, sensitivity, and continuous formation throughout life. Understand the balance between its organic and inorganic components for a comprehensive overview of dental health.